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https://github.com/xen-project/xen.git
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Juergen Gross
171d6ecec1
Add a new function to query whether hypercall buffers are always safe to access by the hypervisor or might result in EFAULT. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/******************************************************************************
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*
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* Split from xc_solaris.c
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*/
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#include "xc_private.h"
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#include <xen/memory.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <malloc.h>
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int osdep_xencall_open(xencall_handle *xcall)
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{
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int flags, saved_errno;
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int fd = open("/dev/xen/privcmd", O_RDWR);
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if ( fd == -1 )
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{
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PERROR("Could not obtain handle on privileged command interface");
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return -1;
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}
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/* Although we return the file handle as the 'xc handle' the API
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does not specify / guarentee that this integer is in fact
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a file handle. Thus we must take responsiblity to ensure
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it doesn't propagate (ie leak) outside the process */
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if ( (flags = fcntl(fd, F_GETFD)) < 0 )
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{
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PERROR("Could not get file handle flags");
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goto error;
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}
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flags |= FD_CLOEXEC;
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if ( fcntl(fd, F_SETFD, flags) < 0 )
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{
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PERROR("Could not set file handle flags");
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goto error;
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}
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xcall->fd = fd;
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return 0;
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error:
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return -1;
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}
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int osdep_xencall_close(xencall_handle *xcall)
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{
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int fd = xcall->fd;
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return close(fd);
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}
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void *osdep_alloc_hypercall_buffer(xencall_handle *xcall, size_t npages)
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{
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return memalign(XC_PAGE_SIZE, npages * XC_PAGE_SIZE);
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}
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void osdep_free_hypercall_buffer(xencall_handle *xcall, void *ptr,
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size_t npages)
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{
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free(ptr);
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}
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int do_xen_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall)
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{
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int fd = xcall->fd;
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return ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
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}
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int xencall_buffers_never_fault(xencall_handle *xcall)
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{
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return 1;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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